fsl-gpu-sdk: Upgrade to 1.2 version

- Upgrade from 1.1 to 1.2 version.
- All the backends (fb, dfb and wayland) are supported
  now with 3.10.31-1.1.0 graphics update.
- Includes the changes to enable fsl-gpu-sdk usage
  with the mx6sx SoC.

Signed-off-by: Neena Busireddy <neena.busireddy@freescale.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
packagegroup-fsl-tools-gpu: Include fsl-gpu-sdk for all backends

fsl-gpu-sdk is now supported for all the backends. So, modify
SOC_TOOLS to remove DISTRO_FEATURES for x11.

Signed-off-by: Neena Busireddy <neena.busireddy@freescale.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>